Condensed Consolidated Statements of Income - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 7,428,000	$ 10,442,600
Operating costs and expenses:
Cost of sales	4,407,500	5,622,200
Advertising	537,200	282,600
Selling	1,631,700	1,615,900
General and administrative	1,093,200	1,080,300
Total operating costs and expenses	7,669,600	8,601,000
(Loss) income from operations	(241,600)	1,841,600
Interest expense	(24,100)	(41,900)
(Loss) income before income taxes	(265,700)	1,799,700
Income tax benefit (expense)	69,400	(718,600)
Net (loss) income	$ (196,300)	$ 1,081,100
Net (loss) income per common share
Basic	$ (0.02)	$ 0.09
Diluted	$ (0.02)	$ 0.09
Weighted average shares outstanding
Basic	11,929,062	11,775,897
Diluted	11,929,062	12,082,292